Mohs hardness scale and observations on hardness of some additional materials

Mohs hardness scale and observations on hardness of some additional materials

Table
Mohs hardness scale and observations on hardness of some additional materials
mineral Mohs hardness other materials observations on the minerals
talc   1 very easily scratched by the fingernail; has a greasy feel
gypsum   2 Mohs hardness scale and observations on hardness of some additional materials2.2 fingernail can be scratched by the fingernail
calcite   3 Mohs hardness scale and observations on hardness of some additional materials3.2 copper penny very easily scratched with a knife and just scratched with a copper coin
fluorite   4 very easily scratched with a knife but not as easily as calcite
apatite   5 Mohs hardness scale and observations on hardness of some additional materials5.1 pocketknife scratched with a knife with difficulty
Mohs hardness scale and observations on hardness of some additional materials5.5 glass plate
orthoclase   6 Mohs hardness scale and observations on hardness of some additional materials6.5 steel needle cannot be scratched with a knife, but scratches glass with difficulty
quartz   7 Mohs hardness scale and observations on hardness of some additional materials7.0 streak plate scratches glass easily
topaz   8 scratches glass very easily
corundum   9 cuts glass
diamond 10 used as a glass cutter
Source: Modified from C. Klein, Minerals and Rocks: Exercises in Crystallography, Mineralogy, and Hand Specimen Petrology. Copyright 1989 John Wiley & Sons. Reprinted by permission of John Wiley & Sons, Inc.
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